A harsh metal-on-metal grinding when you brake usually means the pads are worn through. Every mile makes the repair bigger.
Stop driving it
Grinding brakes can mean there is no pad left and the car may not stop when you need it to. Get it towed or checked before you drive it further.
A starting point, not a diagnosis. Most parts stores read check-engine codes and test batteries for free.
Be careful
Don’t blow brake dust off with compressed air or breathe it in — wet it down with brake cleaner and wipe it away. Never get under a car held up only by a jack — set it on jack stands on flat, solid ground and chock the wheels that stay down.
Your car — the counter needs this
If the counter doesn’t have a part, your shopper asks them to order it under your name and messages you the order number. When it comes in, send someone to collect it.